Repaired iPod Touch screen not locking in.

I just spent the day taking apart a friends iPod Touch, now I'm on to putting the fresh new screen back on...and I run into this problem.

The screen doesn't seem to be locking in place. It seems when you're pushing it, that something's blocking it from locking into place, but there's nothing blocking it. What do you suspect the problem to be?

Did you break off any of the clips from the plastic midframe? They could be stuck, preventing it from closing. It's also possible that the lcd is not completely aligned (try holding the digitizer slightly away from the ipod and seat the LCD in the digitizer, then close the ipod by pressing the metal back to the digitizer).

but my screen would still work i order a screen on the internet for the replacement of the screen but as i installed it started with a White line on the left side of the screen but as time went on the whole screen turned White